In Singapore, day length as well maximum and minimum temperature, remain nearly constant throughout the year. If stable isotope ratios delta 15N/14N were correlated with these factors only, it should not show substantial change throughout the year. However, delta 15N/14N in Singapore does vary considerably over the course of a year. These variations in delta 15/14N in nitrogen oxides substances within Singapore aerosol samples were clearly correlated with declination. Delta 15/14N in nitrogen oxide substances within the aerosol samples reached maximum values at declinations approximately 20� N and 20� S. Minimum values were reached at approximately 0� N and S (Figure 2). Singapore is located at 1.3� N, almost at the equator (0� N and S). Therefore, similar declination values indicate similar positions of the sun from Singapore.

Values of stable isotope ratios delta 15N/14N in nitrogen oxide substances within the aerosol samples were clearly correlated with declination in Singapore

245th National Meeting (2013)

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